American Water Heater ATO-505-P Benutzerhandbuch

Drawing Number:

Drawing Date:

Pres

s

u

re R

e

lief

 Valv

e

3/

4"

 Ball 

Valv

e

3/

4"

 U

n

ion

C

h

ec

k Valv

e

Ke

y

S

Pres

s

ure R

egulat

or

C

irc

ulat

ing Pum

p

Solenoid Valv

e

Boiler D

rain Valv

e

WH-3-D

Domestic Hot W

ater - O

p

ti

o

n

al

 F

reeze Protection

3 Outdoor Tankless W

ater Heaters

Preferred Piping Inst

allation

February 27, 2008

This is not an engineering drawing; it is intended only as a guide and not 

as a replacement for professional engineering project drawings.  

This 

drawing is not intended to describe a complete system.  It is up to the 

contractor or engineer to determine the necessary components and 

configuration of the particular system to be installed.  

The drawing does 

not imply compliance with local building code requirements.  It is the 

responsibility of the engineer or contractor to ensure that the installation is 

in accordance with all local building codes.  Confer with local building 

of

ficials before installation.

Ho

t

W

a

te

r

S

upp

ly

Li

n

e

S

S

V

acuum

Br

eaker

NO

TE:

outside building struc

tur

e

.   

T

hese ar

e indicat

ed 

b

y

 being abo

v

e

 the dashed line

.

line should be located inside the building 

struc

tur

e

. 

T

he vacuum br

eaker line should be locat

ed inside 

the building struc

tur

e

.

NO

TE:

enclosur

e or r

e

cess bo

x and packed with insulation 

for additional pr

ot

ec

tion.

Out

door

Tankless

W

a

ter Heater

Out

door

Tankless

W

a

ter Heater

C

old 

W

a

ter Supply Line 

G

as Supply Line 

Out

door

Tankless

W

a

ter Heater

IMPOR

TANT!

W

ith elec

trical po

w

er supplied t

o

 a 

Tankles 

wat

er heat

er

, it will not 

fr

eez

e

 in en

viornments as cold as 

-30ºF

, when pr

ot

ec

ted fr

om dir

ec

t 

wind exposur

e

.

In

 the ev

ent of a po

w

er failur

e at 

temperatur

es belo

w

 fr

eezing

, the 

wat

er heater should be drained of 

all water t

o

 pr

ev

ent fr

eezing 

damage

.

T

he unit ma

y be drained manually 

or thr

ough the installation of the 

Optional solenoid valv

es as sho

wn.

T

he elec

trical c

onnec

tions f

or the 

tw

o solenoid valv

es should be tied 

to

 the 120 

V po

w

er t

erminals 

pr

o

vided on the PC Boar

d of the 

water heat

er

.

When the elec

trical po

w

er t

o

 the 

wat

er heater fails

, the c

old water 

supply solenoid valv

e closes

, 

heat

er

, and the drain do

wn 

solenoid valv

e opens

, allo

wing the 

wat

er heater and associated piping 

to

 drain.  Ensur

e that y

ou run the 

drain f

or the solenoids per local 

codes

.

Route drain

per local c

odes

17

Tankless

Equipment List 

QTY

Tankless Outdoor            3

W

a

ter Heaters

Electronic Connection *

* Refer to Tankless Accessories 

  and Model 

Applicability for

  electronic connection details.

Normally Closed S

olenoid 

V

alv

e

(F

ull Siz

e

 of C

old 

W

a

ter Supply Line)

1/4 “ 

M

inimum

Normally Open 

Solenoid V

alv

e